Castor

1. A hat made from the fur of the beaver.
2. A heavy quality of broadcloth for overcoats.
3. Castoreum (bitter exudate of mature beavers).
4. Any of various nymphalid butterflies of the genus Ariadne, of Africa and Asia.

noun

A variety of petalite found in Elba.

1. Someone or something that casts

   a caster of spells; a caster of stones; a caster of bronze statuary; an online caster of video games

2. A wheeled assembly attached to a larger object at its base to facilitate rolling. A caster usually consists of a wheel (which may be plastic, a hard elastomer, or metal), an axle, a mounting provision (usually a stem, flange, or plate), and sometimes a swivel (which allows the caster to rotate for steering).

   Many office chairs roll on a set of casters.

3. A shaker with a perforated top for sprinkling condiments such as sugar, salt, pepper, etc.

   a set of casters

4. A stand to hold a set of shakers or cruets.
5. The angle of the axis around which a car's front wheels rotate when the steering wheel is turned, with a vertical axis being defined as zero caster.